Semaphore-signal.



A PATENTED 00T. 22, 1907.

F. B. GOREY. SEMAPHORE SIGNAL.

APPLVIOATIN FILLED MAB.. 27, 1907.

2 SHEETS-SHEET 1.

Illlll Vumlnmm /fflflffflf/ll//f/4 Ill INVENTD' ITI'I /Wl/ ullllllllllllll FRED Ely[Sgm:

has Mw No. 868,648. FATENTED 00T. 22, 1907.

Pp B. GOREY. SBMAPHORE SGNAL.

1 APPLIUATIOI FILED MAR. 27, 1907.

2 SHEETS-SHEET 2.

Fuji- STA" s Arnnr omnes.,

FRED it. GORlfl'i, OF SOHENEOTADY, NEW YOltK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF SEMAPHOREAIGNAL.

ne. assent.

Specification of Letters Patent.

Patented Oct. 22, 1907.

Application filed Marcil 27,1907. Serial No. 364,796- i To ell 'ail/ont 'nl may concern:

Alie it known that I, Fano B. COREY, a citizen of the United States, residing at Schenectady, county ol Schenectady, tit-ate of New York, have invented cortain new and useful Improvements in Semaphore-Signais, el which the following is a specification.

lily invention relates to semaphore signals actuated by electric motors, and its object is to provide simple and effective means for arresting the motion of the seruaphore-arn: when it reaches clear position and the circuit ol the driving motor is opened. 1t is ordinarily desirable to provide means for stopping the semaphore- :uin as soon as the circuit oi the motor is broken, since the distance through which the inertia of the moving parts might curry the arm is indeterminate, because of variation in battery voltage, and the point at which the arm would :stop would vary at different times. v ln order (o arrest the arm at a predetermined position clutch-braidsand locking magnetso various types haw,l bccn cniploycd heretofore.

ily invention consists in employing the motor itself as a brake to arrrst the movement ol' the arm, and provi( ling int-ans lo prevent backward rotationol the motor. l secure the braking effect by sh0r-tcircuiting the motor armature when the motor is disconnected from the source olr uri-ent. To increase the braking effect ihe motor is prol'erably provided with a shunt winding in addition to the main series winding t'cuns for pro renting backward rotation ot the motor is i cnal, since, ii locking magnets or their' 'equiva- 'lcnlzs nrc not ein] doycd, it is customary to maintain the .slot mechanism cncrgized while the signal is at clear, so as to prevent it from being returned to danger' position by its counter-weight, and the torque diie to the countia'at'eight is transmitted by the slot lncclianism to th driving gearing. ll' a Wornrge-.ir of small thread angli, 4 f nil'iloycd on thelnotor shaft, this serves as the nie-ius indcpcinlcnt oi the gearing for preventing the backward rotation of the motor.

My invention `will best be understood by reference to the accompanymg drawings, in which Figure l shous a side elevation, with tho casing' in ccrion, of a semaphore signal arranged in accordance with my invention, I"ig.l2 is a diagram of conecA tions; and Fig. i shows a dctailol cmistruction.

ln Fig. l, ,t rcprcsents an inclosing casing in which is mounted an electric.motor l5. This motor is connected through suitable specdn'cduciug gearing to a dritt .rhecl (el lcosely mounted on the driveshait D, which is ,iou.rnuh. .i.. in a boss D/ in the casing', and carmechanism comprising/ a locking piece F adapted to be engaged by the studs O and magnets G controlling the locking piece F and adapted to move it into and out of the path of the studs C. The particular construction and arrangement of this mechanism forms no part of my invention. y represents ring segments mounted on the shaft D, by means oi' which current is conveyed to the slot-magnets G. ll represents contacts mounted on the drive-shalt D and cooperating with the stationary contacts I to control the circuit oi' the motor. The conv nections oi these contacts are shown in Fig. 2. In this ligure the motornrmat ure is represented by B, the main soriesiield by b, and the auxiliary shunt field by bf. Since the motor is designed for operation from a battery the main field must be se1'ies4voi1nd to prevent short circuiting the battery at starting. The auxiliary shunt iield which is 'provided for braking purposes is preferably connected permanently across the armature tcl'- minals. ln addition tothe main slot-nnlignct winding (i, which is made oi' line wire and connected in shunt to the source, as will be prcsently explained, a sci-ics windingr O assists the shunt winding in attr-.toting the armature and holding it attracted while the motor is operating; the winding G acting alone to maintain the semapln1re-arni clutched to the motor aiterit has reached clear position. 'lwo movable contacts ll and ll/ are l shown on the shaft D. The contact ll is grounded en the shaft, as is also one terminal of theserics magnet windingr G. A stationary contact l coperates with the movable contact ll. The second contact l1 is insulated from the shaft D and coperates with two stav tionary contacts l, which serve as braking,r contacts. J represents a battery or other suitable source of current for the motor and slot-magnets. li, represents a track-relay, which is connected in thc usual manner to the rails' of a block, which is shown occupied by the train L, so that the relay is denergized. The switchcontacts are shown in the position they occupy when the signal is at danger; the direction ol' rotation o1' these contacts, while the semaphore moves from danger to clear p'osition being counterclockwise.

When the train'L leaves the block, the relay K is energized to attract its armature, closing'a circuit from -the lett-hand terminal of battery J through the relay armature, contact segment g, series slot winding G shaft D, contact li, contact l, 1noter-*armature B, and series field I), to the right-hand terminal of the bat tory. The shunt-Held b/.remains permanently connected across the arma-ture terminals oi' the.motor. The closing of the relay-armature also closes the circuit oi the shunt-Winding G, which is connected through the relay-armature directly aci" the terminals of the battery .l. All the windings ot hoth motor :and slot-magnets are consequently energized, so that the motor starts and drives the scmaphttre-arm toward clear position. This continues until contact H leaves stationary contact I, thereby disconnecting the motot` from the source and opening the circuit ot the series winding (Y. At the same time contact H bridges contacts I, thereby directly short-circuiting the mo tor-armature l. Further movement ot' the movingr parts produced hy their inertia drives the motor as a short-cireuitted shunt generator,

causes it to act as a brake to bring the moving parts tov rest. In this way, the sem-aphore-arm is stopped when the motor circuity i It will lie seen from Fig. lv that alter the motor-circuit is opened, the. torque ol' the semaphore counterweight is transmitted through the lgearing to the motor-shaft. driven backward hy this torque, struction shown in Fig. 3. A mcmhcr )l is mounted on the motor-slniit. and a'mcmher is supported on the motor-frame hy means ol' suitahle brackets N The exterior surface oi' the member surface oi the member N are eccentric to each other, and serve as hearingy surfaces t'or the hall t). which is placed between these two members and hcld in posio uickly is broken.

tion l) a rin f (if. which has a central slot to receive the y .s i

hall 0, as indicated hy thc dotted lines in Fig. 2i. The inner surface otl the mcmhcr N is also provided with a central groove, shown in Fig. l.. and in dotted lines inq Fig; IS `vhiclt assists in rctainiitt,T the hall in position. 'lhe direction of rotation oi the motor-shalt` when driving.r the semaphttre-arm, is clockwise. as viewed in Fig. IS', so that the ball t) rolls freely ou the surface oi the member M. llut when the motor-shalt comes to rest and starts to move in toe reverse direction, due to the torque ol' the semaphore ctunter-weight, the ball t) is wedged tightly between the memhers )l and N. and effectively prevents this rotation. Thus. the motor is tree to rotate in one direction, hut. all movement in the opposite direct ion is-prcvcnted.

ido not desire to limit myself to thc particular con- -parts here shown. hut aim in the appended claims to cover all modilications which are within the \\'haty I claim as new and desire to secure Patent; oi the United States. ishr l. ln a semaphore signal, a sentaphorerarm arrat "ed to return automatically to dancer position. an electric motor l'nr tlriviiu.; said artn toward clear position. a source oi` cut'A relit in circuit with .said ltiotor. contacts controlled hy lhe movement ot' said arm adapted to open the motor circuit and lo connect said motor :is a braking' generator to stop tht.` movement otsaid arm. and meansl for pre\.'entinc` haci(- wartl rotation ot' said motor.

'.I. ln a semaphore signal. a semaphorearm arranged to return automaticall lo dancer position, an electric motor t'or driving' said arm toward clear position. a source ot` turrent in circuit with s'. tl motor, contacts controlled hy the movement. ot' said arm adapted to open the motor circuit and lo short-circuit the luolor-arinature lo cause ii to acl as a bi'ake t'or said arm. and meansl lor prcvenlim: hackward rotalion ot said motor.

struction and arrangement oi scope oll my invent ion.

hy Letters and consequently" In order to prevent the motor trom being;- I make use oll the con- 4 and thc interior t In a semaphore signal. a semaphorearrn arranged to t return automatically to danger position, an electric motor havin;- series and shunt field windings for driving said arm toward clear position. asource ot' current in circuit with said motor. and contacts adaptedto open the motor circuit and to short-circuit the motor' armature to cause it to ,l act as a brake for said arm. and means for preventtnf.l t haclnvard rotation ot' the motor. i 4. ln a semaphore signal, a semaphore-arm arranged to return automatically to danger position, an electric motor t'or drivin; .said arm towart clear position, having a main ,l series tield windingl and an auxiliary shunt winding perA manently connected across the armature terminals. a source ot' current in circuit with said motor, contacts adapted to open the motor circuit and to short-circuit the t motor-arnniture to cause it to act' as a brake for said arm, l and means t'or preventing' backward rotation of the motor. l .'t. ln a semaphore signal. a semaphore-arm arranged t0 l return automaticalhv to danger position. an *electric motor, I a source ot current in circuit with said motor, a track re A' lay having its armature included in said circuit. a slot l mechanism for clutching' the motor to the semaphore-arm l including' a magnet winding' connected directly across said l source in series with the relay armature, contacts int eluded in the motor circuit controlled by the movement of l saitl arm and adapted to open the` motor circuit' and to l connect the motor as a braking, generator. and means for l preventing' backward rotation of the' motor. I i ti. ln a semaphore signal. a semaphore-arm arranged to l return automatical l \v to danger position, an electric motor. a source ot' current in circuit with said motor. a track re i lay havin; itsI armature included in said circuit. a slot l mechanism for clutching the motor to the semaphore-arm t including a nnte-net \\'in lin;.; connected directly across said source in series with the relay armature. contacts included i in the motor circuitcontrolled hy the movement of said arm l and adapted to open the motor circuit and to short-circuit i the motor armature. and means fot' preventing' backward l rotation ot' the motor.

T. ln a semaphore signal. a semaphorearm adapted to t return automatically to dancer position, an electric motor l i'or driving' said arm toward clear position. gearing between the motor and said arm adapted to transmit torque from either to the other. a slot mechanism for clutching said motor to said arm. and means t'or preventim,Y backward rotation of said motor comprisingr two members having,r respectively external and internal bearing' surfaces eccentric to each other. one stationary and the other c rried by the motor armature, and a rolling member disposed hctween said hearingsurfaces,

ts'.- ln a semaphore signal, a semaphore-arm arranged to return automatically to danger position. an electric motor for driving said arm toward clear position, gearing hetween said motor and said arm, adapted to transmit torque from either to the other, a source ol' current in circuit with y said motor. contacts controlled by the movement of said l arm adapted to open themotor circuit and to connect d Il motor as a brakim; generator to stop the movement: of `said t arm` and means for preventing the backward rotation oi' said tnotor.

tt. ln a semaphore signal. a senniphore-arm arranged to return automatically to danger position. an electric motor i'or drivin.; said arm toward `clear position. gearing heY tween said motor' and said arm adapted to transmit torque from either to the other, a source ot' current in circuit with motor, contacts controlled h v the movement oi said arm adapted to open the motor circuit and to shortwi -uit the motor armature to cause it to art as a brake for said arm` and means t'or preventing4 the backward rotation ot' said motor. l 'lu witness whereof(v l I '.'tth day ot' March. 'llttVA l have hereunto set my hand this FREI) l. COIHCY. 

